| Literature DB >> 9207086 |
J M de Murcia1, C Niedergang, C Trucco, M Ricoul, B Dutrillaux, M Mark, F J Oliver, M Masson, A Dierich, M LeMeur, C Walztinger, P Chambon, G de Murcia.
Abstract
Poly(ADP-ribose) polymerase [PARP; NAD+ ADP-ribosyltransferase; NAD+: poly(adenosine-diphosphate-D-ribosyl)-acceptor ADP-D-ribosyltransferase, EC 2.4.2.30] is a zinc-finger DNA-binding protein that detects specifically DNA strand breaks generated by genotoxic agents. To determine its biological function, we have inactivated both alleles by gene targeting in mice. Treatment of PARP-/- mice either by the alkylating agent N-methyl-N-nitrosourea (MNU) or by gamma-irradiation revealed an extreme sensitivity and a high genomic instability to both agents. Following whole body gamma-irradiation (8 Gy) mutant mice died rapidly from acute radiation toxicity to the small intestine. Mice-derived PARP-/- cells displayed a high sensitivity to MNU exposure: a G2/M arrest in mouse embryonic fibroblasts and a rapid apoptotic response and a p53 accumulation were observed in splenocytes. Altogether these results demonstrate that PARP is a survival factor playing an essential and positive role during DNA damage recovery.Entities:
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Year: 1997 PMID: 9207086 PMCID: PMC23816 DOI: 10.1073/pnas.94.14.7303
Source DB: PubMed Journal: Proc Natl Acad Sci U S A ISSN: 0027-8424 Impact factor: 11.205